Just to close this out: Bogdan worked up a patch to avoid the fractional-second timestamps unless the new (current autoconf development) autom4te is in used. Here is the basic change: https://git.savannah.gnu.org/cgit/automake.git/commit/?id=b6fa73115d094c8d0da1d6759b6e7c7fca1f8a07 (also appended for the archive)
(Comments tweaked a little in subsequent changes.) Jim is going to start working towards a release over the next days. --thanks, karl. >From b6fa73115d094c8d0da1d6759b6e7c7fca1f8a07 Mon Sep 17 00:00:00 2001 From: Bogdan <bogdro_...@gmx.us> Date: Wed, 1 Nov 2023 17:40:47 -0700 Subject: m4: fall back to non-fractional timestamps with older autom4te. * m4/sanity.m4 (_AM_FILESYSTEM_TIMESTAMP_RESOLUTION): if HiRes is not present in Autom4te/FileUtils.pm, do not consider fractional sleeps. --- m4/sanity.m4 | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/m4/sanity.m4 b/m4/sanity.m4 index db9a1f5..445d1fb 100644 --- a/m4/sanity.m4 +++ b/m4/sanity.m4 @@ -16,10 +16,28 @@ AS_IF([sleep 0.001 2>/dev/null], [am_cv_sleep_fractional_seconds=true], [am_cv_s # _AM_FILESYSTEM_TIMESTAMP_RESOLUTION # ----------------------------------- # Determine the filesystem timestamp resolution. Modern systems are nanosecond -# capable, but historical systems could be millisecond, second, or even 2-second -# resolution. +# capable, but historical systems could have millisecond, second, or even +# 2-second resolution. AC_DEFUN([_AM_FILESYSTEM_TIMESTAMP_RESOLUTION], [dnl AC_REQUIRE([_AM_SLEEP_FRACTIONAL_SECONDS]) +# +# Check if Autom4te uses Time::HiRes. If not, we cannot use fractional sleep, +# because this sanity test and automated tests will be unreliable due to +# Autom4te's caching of results and comparing timestamps. +# More info: long thread around +# https://lists.gnu.org/archive/html/automake/2023-04/msg00002.html +# and https://debbugs.gnu.org/cgi/bugreport.cgi?bug=64756. +AC_PATH_PROG([AUTOM4TE], [autom4te]) +if test x"$autom4te_perllibdir" = x; then + autom4te_perllibdir=`sed -n \ + '/autom4te_perllibdir/{s/^.*|| //;s/;$//;s/^.//;s/.$//;p;q}' <$AUTOM4TE` +fi +if grep HiRes "$autom4te_perllibdir"/Autom4te/FileUtils.pm >/dev/null; then + : +else + am_cv_sleep_fractional_seconds=false +fi + AC_CACHE_CHECK([the filesystem timestamp resolution], am_cv_filesystem_timestamp_resolution, [dnl # Use names that lexically sort older-first when the timestamps are equal. rm -f conftest.file.a conftest.file.b -- cgit v1.1
